Grinding and polishing wheel



UNITED STATES PATENT OEEieE.

J. WENDELL COLE, OF COLUMBUS, OHIO.

GRINDING AND POLISHING WHEEL.

SPECIFICATION forming part Of Letters Patent NO. 226,978, (lated .April 27, 1880. Application inea March 24, 1880. (Model.)

To all whom it may concern:

Be it known that I, J. WENDELL COLE, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented new and useful Irnprovementsin Grinding and Polishing Wheels, of Whichthe following is a specification.

This invention relates to an improvement in the means of bracing wheels against the centrifugal strain and at the same time preventing them from slipping on their arbors.

Composition and natural stone grinding and polishing wheels have been braced against centrifugal strain by means of clamping-disks on each side provided with ribs or rims fitting into corresponding grooves in the sides of the wheels; but this arrangement weakens the wheels in proportion to quantity of material removed or omitted to form the grooves or recesses. Such wheels have also been made thicker near and around their centers than at their peripheries and outer portions, and clamped between rigid concave disks having central apertures to t upon the arbors, said disks being thicker around their central apertures and gradually thinner toward their ed ges, the thicker central portions resisting the breaking strain of the nuts, which force the disks against the wheels. These disks must be formed with their central apertures of various sizes to tit the different-sized arbors of wheels, said arbors varying, of course, in accordance with the size and weight of the wheels. Thus the disks are not interchangeable for Wheels of different sizes and manufa etured by various persons, and are not available as articles ot' commerce.

In order to overcome this disadvantage, I form the concave disks to fit correspondingly convex sides of the wheels, as has been done i before, but I form all the disks ot' given range the arbors and the movable or clamping collars are tenoned to lit exactly into these cen-v of disks having apertures of a diameter within a given range maybe applied to any Wheel having an arbor ot a diameter within a correspondin grange. rlhese disks, it will be readily perceived, can be applied to already-constructed Wheels at a very slight expense for simply turning tenons upon their xed and movable collars.

In the accompanying drawings, Figure 1 represents a diametric section of a Wheel, clampplates, and collars mounted upon an arbor, and Fig. 2 is a similar view with the arbor of smaller size. Fig. 3 is a view ot' an arbor, a set of disks. and the clamping-collar.

The letter A indicates the Wheel, which, it

ons c, which fit into the said central openings,l

and the length of each of these tenons is equal to the thickness of the disks, so that when said tenons are inserted in said openings and the movable collar is forced up to the wheel by nut f their ends will bear against the stone, preventing it from slipping on its arbor, while the only office the disks will be called upon to vperform is to brace the Wheels against eentrifugal strain or tendency to break and fly oi radially.

The central 4openings ofv the disks being made larger, as heretofore explained, than the arbors of a given range of Wheels, it is obvious that the clamping-disks may be applied to already-constructed and various-sized Wheels which are thicker at their centers by simply turning'off the fixed and movable collars of 100 the arbors of such Wheels to form the tenons e. The disks may therefore be sold generally as an article of commerce, and applied at a very trifling expense for alteration of the collars.

rIhe convex-faced disks may also be substitutedfor those with flat faces upon alreadymanufactured arbors, and the concave disks applied thereto by altering the collars.

Having now explained my invention, what I claim is- The combination, with aeonveX-faced grinding or polishing Wheel and its arbor, of the concave clamping-disks having central apertures of greater diameter than said arbor7 and 

